Witness Nick Lindsay, a workman who was surfacing a road nearby, said the man who was shot was sitting in his car when police moved in.

He told Sky News: "The police all came down, they all jumped out of cars with their guns and said, 'Get down', and then there was a smash, then the gun shot went off. By that time police officers grabbed us to move us out of the way."

He said the incident was over in 10 to 15 seconds, but the man had been in the car for around 30 minutes before the police swooped in.

He said: "He was parked there for easily half an hour, I would have said, because he was there when we first turned up this morning. He must have been there at least half an hour, minimum."

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North London Shooting

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The Directorate of Professional Standards - the Metropolitan Police's internal investigator - has been informed of the incident and investigators from the Independent Police Complaints Commission (IPCC) are also at the incident.

Paramedics and an air ambulance were called to the scene, where police earlier cordoned off a section of road around the junction of Bracknell Close and Olympus Grove, near Winkfield Road.

It is the fourth time in recent months that the IPCC has investigated police-related shootings in London.

Joseph Hive, 28, was Tasered a number of times and shot by police in Brent on October 8. He was later charged with robbery and other offences.

James Fox, 43, was shot dead by police at a block of flats in Enfield, north London on August 31. Armed officers stormed the sixth floor after receiving reports a man with a gun was threatening to shoot someone, and a non-police firearm was later recovered.

And the IPCC is investigating an incident on August 21 when a 34-year-old man was shot and injured by officers in south Clapham after a stand-off lasting several hours. A firearm was later recovered.